Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
sach thu » sach thue, sach thieu, sach tham
ve cham » ve chat, vu cham, ve chim
xuc van » duc van, luc van, xuc ban
va cham » va chat, va tham
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa
vi cua » vai cua, di cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach ky) or (sach thu)) nang ma hoi. hieu ((ve cham) or (va cham)) xuc van hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sach thu)) nang ma hoi. hieu ((ve cham) OR (va cham)) xuc van hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sach thu)) nang ma hoi. hieu ((ve cham) or (va cham)) xuc van hanh vi cua tre*.